3 // brk_*: "bracket", the Topeak MTX bracket
4 // rack_*: the Tortec rack
5 // adapt_*: the adapter, ie this file
9 brk_recess_actual = 5.20;
11 rack_rail_dia = 10.40 + 0.50;
12 rack_width_inner = 115.86 + 1.0; // between insides of rails
14 rear_elevation_nominal = 10.04; // top of rack to bottom of bracket
15 rear_to_front_distance = 230;
29 main_sz_z = beside_strap_sz*2 + strap_w;
31 brk_bottom_y = -brk_recess_actual;
32 adapt_main_top_y = brk_bottom_y + general_gap_y;
35 rack_rail_x = -(rack_width_inner/2 + rack_rail_dia/2);
36 rack_rail_outer_x = -(rack_width_inner/2 + rack_rail_dia);
38 grasp_large_r = (rack_rail_dia + grasp_sz)/2;
39 grasp_large_x = rack_rail_outer_x + grasp_large_r;
41 block_x = grasp_large_x + grasp_large_r/2;
42 block_y_min = adapt_main_top_y - main_sz_y;
44 module GraspElevation(){
46 translate([ grasp_large_x, adapt_main_top_y - grasp_large_r ])
47 circle(grasp_large_r);
49 translate([ grasp_large_x, $rack_rail_y - rack_rail_dia/2 ])
50 circle(grasp_large_r);
52 translate([ grasp_large_x, $rack_rail_y + rack_rail_dia/2 ])
53 circle(grasp_large_r);
57 module BlockElevation(){
58 rectfromto([ +block_x, adapt_main_top_y ],
59 [ -block_x, block_y_min ]);
62 module GraspFixingElevation(){
64 mirror([1,0]) GraspElevation();
66 rectfromto([0, $rack_rail_y],
67 [rack_width_inner, 50]);
69 translate([ rack_rail_x, $rack_rail_y ])
70 circle(r = rack_width_inner/2 - rack_rail_x, $fa=1);
72 [ rack_width_inner/2, 0 ],
73 [ rack_width_inner/2, $rack_rail_y - rack_rail_dia/2 ],
74 [ -block_x, block_y_min ],
81 module StrapBarrelElevation(){
82 translate([ rack_width_inner/2 + strap_barrel_dia/2,
83 $rack_rail_y + rack_rail_dia/2 + strap_barrel_dia/2 ])
84 circle(strap_barrel_dia/2);
89 $rack_rail_y = brk_bottom_y - $elevation_nominal
90 - general_gap_y - rack_rail_dia/2;
94 linextr(0, main_sz_z){
97 StrapBarrelElevation();
101 linextr(0, main_sz_z){
102 GraspFixingElevation();
105 translate([0,0, main_sz_z/2]) linextr(-strap_w/2, +strap_w/2) {
106 translate([ rack_width_inner/2 - strap_th, 0 ])
107 rectfromto([ 0, -50 ], [ 50, 50 ]);
112 linextr(-10, main_sz_z+10) {
115 translate([ rack_rail_x, $rack_rail_y ]){
117 for (dx = [-rack_rail_dia, 0])
119 circle(r= rack_rail_dia/2);
128 Principal($elevation_nominal=0);